Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                               2021 October 27
      [2]The picture shows the NGC 6995 known as the Bat Nebula for its
   shape. It is part of the larger Veil Nebula. Please see the explanation
                       for more detailed information.

                          NGC 6995: The Bat Nebula
                Image Credit & Copyright: [3]Howard Trottier

   Explanation: Do you see the bat? It haunts [4]this cosmic close-up of
   the eastern [5]Veil Nebula. [6]The Veil Nebula itself is a large
   supernova remnant, the expanding debris cloud from the [7]death
   explosion of a massive [8]star. While the Veil is roughly [9]circular
   in shape and covers nearly 3 degrees on the sky toward the
   constellation of the Swan ([10]Cygnus), NGC 6995, known informally as
   the Bat Nebula, spans only 1/2 degree, about the apparent size [11]of
   the Moon. That [12]translates to 12 light-years at the Veil's estimated
   distance, a reassuring 1,400 light-years from [13]planet Earth. In the
   composite of image data recorded through [14]narrow band filters,
   emission from [15]hydrogen atoms in the remnant is shown in red with
   strong emission from [16]oxygen atoms shown in hues of blue. Of course,
   in the western part of the Veil lies [17]another seasonal apparition:
   [18]the Witch's Broom Nebula.

              Explore Your Universe: [19]Random APOD Generator
                     Tomorrow's picture: Mirach's Ghost
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    Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell
                                 ([34]UMCP)
          NASA Official: Phillip Newman [35]Specific rights apply.
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                A service of: [37]ASD at [38]NASA / [39]GSFC
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2110/Bat6995_Trottier_3449.jpg
   3. https://www.astrobin.com/users/htrottier/
   4. https://www.astrobin.com/r5ng33/
   5. https://en.wikipedia.org/wiki/Veil_Nebula
   6. https://apod.nasa.gov/apod/ap191031.html
   7. https://www.youtube.com/watch?v=OyntBsxoEkA
   8. https://starchild.gsfc.nasa.gov/docs/StarChild/universe_level1/stars.html
   9. https://www.mathsisfun.com/algebra/trig-interactive-unit-circle.html
  10. https://en.wikipedia.org/wiki/Cygnus_(constellation)
  11. https://apod.nasa.gov/apod/ap130801.html
  12. https://chandra.harvard.edu/photo/scale_distance.html
  13. https://www.globe.gov/en
  14. https://apod.nasa.gov/apod/ap071102.html
  15. https://periodic.lanl.gov/1.shtml
  16. https://youtu.be/5Q3ft8OsFaM
  17. https://i.ytimg.com/vi/1Kl4rNUTWCA/hqdefault.jpg
  18. https://apod.nasa.gov/apod/ap180408.html
  19. http://apod.nasa.gov/apod/random_apod.html
  20. https://apod.nasa.gov/apod/ap211026.html
  21. https://apod.nasa.gov/apod/archivepix.html
  22. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  23. https://apod.nasa.gov/apod/lib/aptree.html
  24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  25. https://apod.nasa.gov/apod/calendar/allyears.html
  26. https://apod.nasa.gov/apod.rss
  27. https://apod.nasa.gov/apod/lib/edlinks.html
  28. https://apod.nasa.gov/apod/lib/about_apod.html
  29. http://asterisk.apod.com/discuss_apod.php?date=211027
  30. https://apod.nasa.gov/apod/ap211028.html
  31. http://www.phy.mtu.edu/faculty/Nemiroff.html
  32. http://www.phy.mtu.edu/
  33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  34. http://www.astro.umd.edu/
  35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  36. https://www.nasa.gov/about/highlights/HP_Privacy.html
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. http://www.mtu.edu/